C2024-20964 Modifying Martensitic Steels to Reduce Susceptibility to Hydrogen Embrittlement by Heat Treatment and Mo Addition

Magdalena Eskinja, Masoud Moshtaghi, Gerald Winter, Juergen Klarner, Holger Schnideritsch, Gregor Mori - In the recent years, hydrogen appears to be a promising alternative to fossil fuels, therefore evolvement of materials for hydrogen transportation and storage facilities is important.However, exposure of high-strength steels to hydrogen can have a detrimental influence on their performance due to elevated susceptibility to hydrogen embrittlement (HE). The influence of Mo addition has been reported to be beneficial in case of a sulfide stress cracking, where the formation of sulfide layer on material surface can affect hydrogen induced crack propagation. However, in sulfide-free environment, there is limited knowledge about HE behaviour of martensitic steels. Furthermore, combined effect of tempering temperature and Mo can induce change of microstructural features, such as formation of hydrogen trapping sites, which can have a beneficial role in supressing HE.In this study two